Births per 10,000 of 23 year old women, U.S., 1917-1975
183.1
183.9
163.1
179.5
181.4 
173.4
167.6
177.4
171.7
170.1
163.7
151.9
145.4
145.0
138.9
131.5 
125.7
129.5
129.6
129.5
132.2
134.1
132.1
137.4
148.1
174.1
174.7
156.7
143.3
189.7
212.0
200.4
201.8
200.7
215.6
222.5
231.5
237.9
244.0
259.4
268.8
264.3
264.5
268.1
264.0
252.8
240.0
229.1
204.8
193.3
179.0
178.1
181.1
165.6
159.8
136.1
126.3
123.3
118.5


